Issue #1151 resolved
I noticed a dangerous regression in some code which accidentally upgraded from 2.5.12 to 2.6.0a1:
wb = load_workbook(filename=filename) for worksheet in wb.worksheets: rows = worksheet.rows
With 2.5, rows will contain the data. With 2.6.0a1 rows will be an empty tuple, so code which attempts to handle empty sheets will silently miss data.